Kerr provides a nice overview of what life was like inside a medieval monastery, focusing on topics like physical layout, routines, prayer, sleep, manual labor, food/drink, dress, hygiene, family relationships, illness, silence, communication, and so on. Her examples are drawn primarily from English (and some French) monasteries, and there are plenty of examples, quotes, and anecdotes to support her generalizations while also showcasing the diversity of experiences and the evolution of practices from the early through late medieval periods.
The writing feels a bit "list-y," as though it were a literature review or series of research notes strung together. It's still a smooth read, but it feels a bit like a reference work. At any rate, the book delivers on its core promise of summarizing the general quotidian contours of life inside the cloister.